Improvement in slide and steam valves



J. E. SCHULTZ. Slide and Steam Valve.

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MPETERS, PHOTO-LITHOGRAPHER. WASHINGTON D I UNITED STATES PATENT OEEIoE.

JOHN E. SCHULTZ, OF CINCINNATI, OHIO.

IMPROVEMENT IN SLIDE AND STEAM VALVES.

Specification forming part of Letters Patent No. 204,617, dated June 4,1878; application filed March 4, 1878.

steam-moved piston-valve, the latter being operated by steam admittedthrough a small slide-valve having a positive motion by direct outsideconnection with the plunger of the pump.

My invention consists, in the first part, in the provision, between themain steam-chest and the cap in which the positive-movin g valveoperates, of a small aperture, governed by a needle-pointedadjusting-screw, for the purpose of nicely regulating the amount ofsteam admitted to actuate the steam-moved pistonvalve, the object beingto prevent the latter being shot across too violently at any time.

My invention consists, in the second part, in a peculiar construction ofthe steam-moved piston-valve, by which its motion is arrested at theends of its stroke by a novel device for cushioning.

In the accompanying drawings, Figure l is a vertical section of my pump,taken through the length of the steam-mowing piston-valve. Fig. 2 is apart-section taken at right angles to Fig. 1. Fig. 3 is a section of ahead embracing the first part of my invention, but with an ordinary wayof checking the steammoved piston-valve at the ends.

A is the pump, and B the steam-cylinder, united by the uprightframe-work G. On the upper flange of the steam-cylinder I rest a plate,D, which contains the ports which pass steam to fend from cylinder B.The slidevalve E rests on this plate and governs the ports. It has alug, e, which fits between the ears f of the steam-moving piston-valveF. It has piston-heads f, moving in short cylinders G formed in the boxor steam-chamber H. Boiler-steam is admitted freely at one side of thisbox through pipe I, and exhausted at the other side through passage J,its admission to the cylinder B and discharge therefrom being governedby the slide valve E. Be-

ton-valve I introduce springs M of thin coiled German-silver wire, and Iusually make the springs doublethat is, one within another, to securegreat flexibility. The piston L alone in the close cylinder makes a goodcushion and materially assists the springs, and the addition of thesprings renders the cushioning positive and determinate.

On the steam chest or box H I fit a detachable Valve-plate, N, whoselower side corresponds in its ports with the ports of the steamchest H,and whose upper face receives the The plate is surmounted by a dome, P,at the top of which an oil-cup may be inserted at the aperture 1;.

In order to limit a supply of steam used to actuate the steam movedpiston valve F to properly determine the quantity, I provide a verysmall aperture, q, to convey steam from the live-steam chamber, that iswithin the piston-heads of the box H. This small aperture extends upwardinto the dome P, and its upper end is governed bya needle-pointedadjustingscrew, Q. By the provision of this small aperture and itsdelicate adjustment, shocks and breakages, occasioned by the violentshooting of the piston-valve F, are entirely avoided, and I am enabledto govern the motion of my pump with great precision without interferingwith the positiveness and reliability of its action. By the provision ofthe plate N Iam enabled to adjust the main valve without any difficulty,as when the plate is removed the entire interiorof the steam-chamberisexposed.

I claim 1. In combination with the steam-chest H and its valvemechanism, and the chamberP which contains the positive-moving valve 0the aperture q, with its needle-pointed adjusting-screw Q,substantiallyas and for the purwhich is never so great as to overcome the posespecified. weight and friction of the piston-valve.

2. In a steam-pump, the combination, snb- In testimony of whichinvention I hereunto stant-ially as specified, of the hollow doublesetmy hand.

headed piston-valve, moved only by steam, JOHN E. SCHULTZ. thestationary rod K, provided with a cen- \Yitnesses:

trallydisposed fixed collar or piston, L, and JOHN E. JONES,

light cushioning-springs M, the tension of CHAS. A. NEALE.

